A more certain way would be to use a high duty cycle peristaltic pump to push water through & not restrict it after the CR (similar to Ian's set up). I've not implemented it yet. - I actually have a peristaltic pump lying around, so to clarify, to do this, do we remove the current pump feeding the CR and use the peristaltic pump instead or do we continue to use the feeding pump and install the peristaltic pump after to push the water through the effluent ?